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The unconventional exchange-bias (EB) effect in single crystals of RFeO₃(R=Nd,0.28em0exSm) compensated ferrimagnets (fMs), composed of two antiferromagnetically (AFM) coupled R and Fe sublattices with opposite ferromagnetic (FM) moments, exhibiting the FM moment reversal via a fast spin switching is reported. In NdFeO₃, the EB anisotropy field emerges and diverges upon approaching the compensation temperature TcompNd=9.20.16em0exK, and changes sign with crossing TcompNd, in similarity to the behavior observed recently in ErFeO₃. In contrast, SmFeO₃ exhibits a substantial EB, not only at its TcompSm=4.80.16em0exK, but also at higher temperatures up to 100 K, and the EB changes its sign with increasing cooling field. It is shown that in all known RFeO₃ (R=Nd,0.28em0exSm,0.28em0exEr) compensated fMs the field-induced FM moment reversal is similarly exchange biased near Tcomp.
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Fita et al. (2018) studied this question.
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